JAVA 引用对象的实例方法
package com.interfaces; public class PrinterDemo { public static void main(String[] args) { usePrinter((String s)->{ System.out.println(s.toUpperCase()); }); usePrinter(s-> System.out.println(s.toUpperCase())); PrintString ps = new PrintString(); usePrinter(ps::printUpper); //Lambda表达式被对象实例方法替代的时候,他的形式参数全部传递给该方法作为参数 } private static void usePrinter(Printer p){ p.printUpperCase("HelloWord"); } }
package com.interfaces; public interface Printer { void printUpperCase(String s); }
package com.interfaces; import java.util.Locale; public class PrintString { public void printUpper(String s){ String s1 = s.toUpperCase(); System.out.println(s1); } }